CAJ | 학술논문

对四步法三维五向编织工字梁结构的弯曲性能进行了数值分析和实验研究。首先根据三维五向编织复合材料细观结构模型对材料进行刚度预测，讨论编织参数对材料性能的影响；在此基础上，将预测得到的单胞力学性能应用到宏观结构上，建立三维五向工字梁有限元模型，对其弯曲性能进行数值分析；最后采用RTM工艺制作工字梁试件进行四点弯曲试验，将结果与有限元计算结果进行对比。结果显示，编织参数的变化对三维五向编织复合材料的性能有着较大影响，有限元分析结果与试验结果基本一致。
대사보법삼유오향편직공자량결구적만곡성능진행료수치분석화실험연구。수선근거삼유오향편직복합재료세관결구모형대재료진행강도예측，토론편직삼수대재료성능적영향；재차기출상，장예측득도적단포역학성능응용도굉관결구상，건립삼유오향공자량유한원모형，대기만곡성능진행수치분석；최후채용RTM공예제작공자량시건진행사점만곡시험，장결과여유한원계산결과진행대비。결과현시，편직삼수적변화대삼유오향편직복합재료적성능유착교대영향，유한원분석결과여시험결과기본일치。
Experimental study and numerical analysis were made on the bending properties of three-dimensional five-directional braided I-shaped composite structure. Firstly,a microstructure model was built to predict the rigidity of the material and study the effects of braiding parameters on the material properties. Based on these,the predicted mechanical properties of the unit cell were used in macrostructure to build a finite element model for the three-di-mensional five-directional I-shaped composite structure and make numerical analysis on its bending properties. Fi-nally,I-shaped composite specimens were molded by RTM to make four-point bending tests and compare the test re-sults with the finite element calculation results. This study showed:( 1 ) The change of braiding parameters had a strong influence on the properties of the braided composite structure;(2) The results of finite element analysis vir-tually agreed with the experimental results.